The revolution has begun! Web video will be freed from the shackles of the MPEG-LA and the dreaded claws of patents and incomprehensible licenses! Sorry, I got a little carried away there. Anywho, YouTube has announced all new videos uploaded to the site will be transcoded into WebM, and that the most important part of the site's catalogue is already available in WebM.

That depends. I tried to upgrade to Firefox 4.0 a week or two ago but ended up switching back to 3.6 after spending two hours tracking down an addon-related bug and discovering that, on a fresh profile, it was triggered by a very specific mix of over a dozen different addons I wasn't willing to give up.

I kept records, so if they don't release a 4.0.1 that fixes it, maybe I'll try to muddle my way through gdb to figure out what causes it one my exams are over.

Of course, I also have a copy of Chromium I can always fire up if need be.

That depends. I tried to upgrade to Firefox 4.0 a week or two ago but ended up switching back to 3.6 after spending two hours tracking down an addon-related bug and discovering that, on a fresh profile, it was triggered by a very specific mix of over a dozen different addons I wasn't willing to give up.

I kept records, so if they don't release a 4.0.1 that fixes it, maybe I'll try to muddle my way through gdb to figure out what causes it one my exams are over.

Of course, I also have a copy of Chromium I can always fire up if need be.

There are 400 million Firefox users, you are not 25% of browser users.

However, amongst the 7% of browser users who have by now taken up Firefox 4, some like you in rare circumstances have noticed bugs, and have reported them back to Mozilla.